Automatic stop for electric hoisting apparatus.



No 850,694. PATENTED APR. 16, 1907 H. S. VALENTINE. AUTOMATIC STOP FORELEGTRIG'HOISTING APPARATUS.

APPLICATION FILED JAN.10. 1907.

a SHEETS-SHEET 1.

ITNESSES' my-01a w rn: NORRIS Fri- 4: cm, wAsumarau, n. c.

Search NQ. 850,694. PATENTED APR. 1a, 1907.

' H. s, VALENTINE.

AUTOMATIC STOP FOR ELECTRIC HOISTING APPARATUS. I APPLICATION FILED JAN.10, 1907;

' a SHEETSSHEET z.

&

FUiUI LJ IIJJDj W NESSES [:VVENTOR rut NORRIS PETER s ca, wasmucrmv. -0:

GBUIUH D No 850,694. PATENTED APR.16, 1907. H. S. VALENTINE.

AUTOMATIC STOP FOR ELECTRIC HOISTING APPARATUS.

APPLICATION FILED JAN. 10, 1907.

3 SEEETSSHB ET 3:

A Home W TNESSES I [)VVENTOR 1H: NORRIS rzrrn: cm, Wsnlumon n c UNITEDSTATES EATENT OFFICE.

' HERBERT S. VALENTINE, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE &TOWN E MANUFACTURING COMPANY, OF STAMFORD, CON- NECTICUT.

AUTOMATIC STOP FOR ELECTRIC HOISTING APPARATUS.

Specification of LettersPatent.

Patented April 16, 1907.

Application-filed January 10, 1907. Serial No- 351.662

others skilled in the art to which it appertains to make and use thesame.

" My invention relates to 'an improvement in automatic stops forelectric hoisting apparatus and it consists in the parts andcombinations of parts, as will be more fully described, and pointed outin the claims.

In the accompanying drawings, Fi ure l is a view in elevation of aportable electric hoist embodying my invention. Fi 2 is an end view ofthe controller, showing t 1e screw and means actuated thereby forautomatically operating the controller. Fig. 3 is a View, partly insection and partly in elevation, of one end of the controller; and Fig.4

is a view in section on line w :z: of Fig. 3.

1 represents the supporting or carrying frame provided at its upper endwith the hook 2, by which the apparatus is suspended from an elevatedsupport. Carried by frame 1 is the motor 3, having a shaft 4, carryingat its end a pinion which engages a gear-wheel within the casing 5. Thiswheel is arranged in an inclined position, as shown, and its shaft isprovided with a worm which meshes with a worm-wheel on shaft 6, wherebysaid shaft is driven by the rotation ofthe shaft 4 of the motor 3.Hoist-drum 7 is secured to shaft 6 and carries hoist rope or chain 8,which passes under sheave 9 in block 10.

Secured to the under side f. the motor is the controller 11, providedwith a shaft 12, carrying the controller-cylinder and having at one enda sheave around which the two actuating-ropes 13 are Wound in oppositedirections, the said ropes being each provided with a handle 14, bywhich the controller-shaft may be actuated or turned manually. With theropes in the position shown, by pulling down on one rope 13 the motorwill be started to wind or unwind the hoistrope, and by then. pulling onthe other ropethe motor will be brou lit to astop, and then bycontinuing the ownward pull the direction of rotation of the hoistmotorand drum will be reversed.

'Loosely mounted on the end of the controller-shaft "adjacent to theframe 1 is a spiralor-worm wheel 15, which latter is engaged by thespiral or worm wheel '16, loose on shaft 17. This shaft is suitablymounted in bearings 26 on the controller-frame and,

carries at one end'a fixed sprocket-wheel 18,

which is engaged by an endless sprocketchain 19, passing around asprocket-wheel on the drum-shaft 6. From this it will beseen that whenthe drum 7 is rotating in either direction motion .is imparted to shaft17, thus causing them to rotate in unison. Shaft 17 is screw-threaded,as at 20, throughout a pertion of its length and is provided with theshouldered stops 21, secured thereto was to rotate therewith.

Mounted on the screw-20 intermediate the stops '21 is the shouldered nut22,- having threads conforming to ,the threads on the screw 20. This nut22 is provided with a spline 23, which rests and moves in groove 24 inthe sleeve 25, the latter bein mounted in the bearing 26,formed on the"frame of the controller.

The outer end of sleeve 25 is closed by the box 27, in which the outerend of shaft 17 rests and is su orted, and the sleeve 25 and box 27 areheiii in place by the nut 28*, secured onto the end of shaft 17. The endof sleeve 25 adjacent toworm-whecl 16 is provided with clutch-teeth 28,which rest be-- tween clutch members 29.0n worm-wheel 16. Hence it willbe seen that when sleeve 25 is rotated worm-wheel 16 will be rotated andimpart movement to the worm-wheel 15 on in unison with the hoist-drum 7,and as the shaft rotates the loose nut 22, which is held againstrotation by its spline 23 in groove 24 of sleeve 25, is caused to travellengthwise the screw 22, the sprocket-chain and wheels bein designed toallow a predetermined num er of feet hoisting or lowering on thehoisting-drum. If through carelessness or otherwise the controller benot manually o,p

erated to stop the motor when the limit of travel for which the hoisthas been set is reached, a shoulder on the traveling nut engaging one ofthe fixed stops 21 on shaft 17 causes nut 22 to turn and in turn rotatesthe sleeve 25, and'the latter in turn rotates the spiral gear 16 throughthe clutch members'28 and 29, before referred to. The rotation of spiralgear 16 imparts rotation to the spiral gear 15, and the clutch memberthereof, then resting in contact with the clutch member 31 on thecontroller shaft or cylinder, turns the latter back to its off positionor position of rest and, if the momentum be great enough, back to thefirst lowering step. The same is also true in lowering.

To adjust the height of lift,-the hoist-rope should be wound until thelifting-hook is at the desired height and the nut 28 on shaft 17 turnedin a direction to allow the sleeve 25 to be withdrawn sufficiently todisconnect its clutch members from the clutch members on spiral .gear16. The sleeve is then rotated by hand, thereby causing the travelingnut 22 to move into contact with the stop 21, which controls thehoisting. motion, after which the sleeve 25 is restored to its normalposition and secured by tightening up nut 28.

With this construction the controller can be operated by hand by theropes 13, and it is only when not stopped, either in hoistin orlowering, at the proper point that the automatic stop mechanism comesinto operation and shifts the controller-cylinder back to its offposition.

It is evident that many slight changes might be resorted to in therelative arrangement of parts shown and described without departingfromthe spirit and scope of my invention. Hence I would have it understoodthat I do not wish to confine myself to the exact construction andarrangement of parts shown and described, but consider myself at libertyto make such sli ht changes as fairly fall within the spirit an scope ofmy invention.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination with a motor-controller and a screw rotating with themotor, of means for manually operating the controller, a sleeve, meansactuated by the screw for rotating the sleeve under certain conditions,and caring connecting the sleeve and controller-s aft, one member ofsaid gearing being coupled to the controller-shaft by a connection whichpermits of a partial rotation of said shaft independent of said gearingmember.

2. The combination with a motor, a controller having a rotating shaft,and a screw rotating with the motor, of :a sleeve, means actuated by thescrew for rotating the sleeve when the limit of the hoisting or loweringmovement of the hoist-rope has been reached, gearing actuated by saidsleeve, and .alined stops on one member of said gearing and thecontroller-shaft whereby the latter is actuated by the rotation ofsaidgearing.

3. ha stop mechanism for hoisting devices the combination with ahoist-drum, a motor, a hoist-rope, a controller and devices for manuallyactuating said controller, of a gear-wheel loose on the controller-shaftand having a clutch member or shoulder adapted to engage a similarmember on the controllershaft, the clutch members being so located as toermit full operating motion of the contro ler-shaft manually, and meansfor rota-ting said gear-wheel when the hoist-block reaches apredetermined point in either hoisting or lowering.

4. The combination with a carrying-frame, a motor, a controller,hoist-drum, and gearing connecting the motorand drum, of a screw-shaftgeared to the drum so as to rotate therewithand provided with shoulderedsto s, a nut mounted to travel on said screw an provided with shoulders,a sleeve embracing the screw and having agroove to receive a spline onthe nut, a gear-wheel loose on the screw-shaft, clutch membersconnecting the sleeve and gear-wheel, a gear-wheel loose on thecontroller-shaft and meshing with the gear-wheel clutched to the sleeve,and coupling means on the controller-shaft and the gear thereon wherebythe controllershaft is actuated by the gear-wheel when the hoist-blockreaches a predetermined point either in hoisting or lowering.

5. The combination with a motor, a hoistdrum, a controller and means formanually operating the controller-shaft, of a earwheel loose .on thecontroller-shaft and having a shoulder ada ted to engage a shoulder onthe controller-s aft and turn the latter to its off position, the saidshoulders being so located as to allow free manual operation of thecontroller-shaft without interference from said gear, and means forrotating said gear at the limits of the hoisting or lowering movementsof the hoist-chain.

6. The combination with a frame, and a motor-controller and drum carriedthereby, and means for manually operating the controller, of ascrew-shaft, gearing connecting the latter and drum, a gear-wheel looseon the screw-shaft, a gear-wheel meshing said first-mentioned gear andloosely mounted on the controller-shaft, means on the controllershaftadapted to be engaged by means on the gear-wheel on said shaft whereby aturning movement may be imparted to said shaft, and means actuated bsaid screw-shaft for rotating the gear-wheef; when the hoist-ropereaches the limits of hoisting and lowering movements.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

HERBERT S. VALENTINE.

Witnesses:

SoHUYLER MERRITT, S. B. AVERY.

